l8 ENTOMOLOGICAL NEWS. [Ian., 'iS 



(Subfamily DORYLINAE.) 

 Claws toothed Eciton 



E. opacithorax Emery. 



The workers of this species have vestigial eyes, hence lead 

 hypogaeic or subterranean lives. Specimens were captured 

 while they were trailing over the ground in single file. The 

 species does not seem to be numerous in the northwestern 

 part of the State, the writer only having taken specimens on 

 two different occasions. 



Subfamily MYRMICINAE. 



1. Postpetiole joined to the dorsal surface of the gaster, which is 



flattened dorsally, more convex ventrally and acutely pointed. 



Cremastogaster 

 Postpetiole joined to the anterior basal portion of the gaster.. 2. 



2. Meso-epinotal constriction usually faint or lacking 3. 



Meso-epinotal constriction distinct 4. 



3. Antennae ii-jointed; workers monomorphic; head and thorax not 



rugose Leptothorax (in part) 



Antennae 12-jointed; meso-epinotal constriction as well as pro- 

 mesonotal constriction absent; the head and thorax distinctly 

 rugose Pogonomyrmex 



4. Antennae 11 -(jointed 5. 



Antennae i2-jointed 6. 



5. Head with one pair of occipital spines, thorax with three pairs of 



dorsal spines; integument rough, bearing stiff or hooked hairs. 

 (At fa). (One subgenus in South Carolina, which has numerous 

 tubercles on the head, thorax and abdomen Trachymyrmex) 

 Thorax and petiole without any traces of teeth or spines; body 

 slender; workers monomorphic Monomorium 



6. Last four joints of the antennae forming a rather distinct club: 



workers with slender thorax and legs; monomorphic, 



Aphaenogaster 

 Last three joints of the antennae forming a club 7. 



7. The club very distinct; the workers strongly dimorphic; soldiers 



with large heads Pheidole 



The club not quite so distinct; meso-epinotal constriction deep and 



distinct; workers monomorphic, 



Leptothorax, sub-genus Dictothorax (in part) 

 Head and prothorax distinctly striated; pro-mesonotal constriction 



absent; imported species Tetramorium 



Genus Cremastogaster Lund. 



I. Workers with distinct mid-dorsal thoracic carina 2. 



Workers without distinct mid-dorsal thoracic carina, 



virtima F. Smith subspecies missouriensis 



